I checked up on this for you and it seems (from what I can tell), Total Commander (name change) is now at ver.6.03a.
I'm pretty sure the author is "ghisler". It's some sort of shareware file manager run from the command line, though you'll
have to dig deeper for yourself because I am unfamiliar with the program.

Yes ..that seems to be it.There is a bit of a tutorial there but I am still not much the wiser but it seems that you can move some files from your 'c' drive to your 'd' drive to free up space. But I might be wrong altogether.
Thanks for your help.
Warren

I took another look for tutorials, though couldn't find anything specific. I did locate a page you may be able to investigate further. Seems these people
are into the use of these sort of tools. Scroll down to the second post by Tom Fosson.

There's a large listing of tutorial links that may be of assistance. (he misplaced that link)
You also may be able to persist that thread. Just an idea.

GF

Late In : Here's a French page with a 706kb zip-tutorial in English. Though not your version, it might be worth a try.
It's the fourth one down.